Add DEVELOPMENT.md

DEVELOPMENT.md

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+# How to Develop Netron
+
+Netron can run as both an [Electron](https://electronjs.org) app or a Python web server.
+
+## Develop the Electron app
+
+The start the Electron app, install [Node.js](https://nodejs.org) and run: 
+
+```bash
+npm install
+npx electron .
+```
+
+To debug the Electron app use [Visual Studio Code](https://code.visualstudio.com) and install the [Debugger for Chrome](https://marketplace.visualstudio.com/items?itemName=msjsdiag.debugger-for-chrome) extension. Open the `./Netron` root folder in Visual Studio Code and press `F5`. To attach the debugger to the actual rendering window select the `Debug` tab and `Debug Renderer Process` before launching.
+
+To build full Electron app binaries to the `./build/electron` folder run `electron-builder`:
+
+```bash
+npx electron-builder --mac --linux --win
+```
+
+## Develop the Python server
+
+To build and launch the python server run:
+
+```bash
+npm install
+python ./setup.py --quiet build
+PYTHONPATH=./build/python/lib python ./build/python/scripts-2.7/netron [...]
+```
+
+The same can be accomplished by running the `./netron` script in the enlistment root folder.